feat: Web哨兵监控面板桌面端视图改进三栏布局·低噪声·渐进披露 (#1025)

- 桌面端(≥1024px)三栏 master-detail：Runs | Detail | Findings，点击 run 无需滚动
- 状态摘要条替换 4 metric cards，单行 ~48px，合并 status-pill/overall 重复值
- overview checks 全绿折叠为单 pill，点击展开明细
- runs/findings filter 默认折叠为单行摘要 chip，展开功能不变
- Detail 分 5 tab(概要/发现项/多轮摘要/Trace/证据与命令)，URL 支持 ?run=&tab=
- Finding 默认显示聚合，点击 chip drill-down 到列表；item 默认折叠只显示 title+severity+count
- Runs 行级 severity 色条(red/amber/info 左 border)，一眼定位问题行
- Timeline 升级为底部紧凑条，加相对时间刻度，可折叠
- auto-refresh 交互暂停：hover runs/detail 时暂停刷新
- CLI 命令改可复制按钮+toast，detailCommands 不再纯文本
- 快捷键 j/k 上下选 run、Enter 打开、r 刷新、/ 聚焦搜索
- 降权标签：减少 uppercase/font-weight:800 滥用，只在 red/blocked 强调
- 去冗余 box-shadow：panel 用 1px border，只在 modal/overlay 用阴影
- contract version 升级 draft-2026-06-26-p9-desktop-view-density
- 保持纯 vanilla JS + 原生 CSS，无框架/无构建步骤，API 契约不变

scripts/src/hwlab-node-web-sentinel-service.ts

@@ -1,6 +1,6 @@
 // SPEC: PJ2026-01060508 Web哨兵 draft-2026-06-25-p0-web-probe-sentinel.
 // SPEC: PJ2026-01060508 Web哨兵 draft-2026-06-26-p7-web-probe-sentinel-dashboard.
-// SPEC: PJ2026-01060508 Web哨兵 draft-2026-06-26-p8-web-probe-sentinel-recovery.
+// SPEC: PJ2026-01060508 Web哨兵 draft-2026-06-26-p9-desktop-view-density.
 // Responsibility: Persistent HTTP wrapper service for web-probe observe scheduling, index, health, metrics, maintenance, and dashboard.
 import { Buffer } from "node:buffer";
 import { createHash, randomUUID } from "node:crypto";
@@ -12,7 +12,7 @@ import { renderWebProbeSentinelDashboardHtml, webProbeSentinelDashboardAssetResp
 import { webProbeSentinelConfigPlan, type WebProbeSentinelConfigPlan } from "./hwlab-node-web-sentinel-config";
 import type { HwlabRuntimeLaneSpec } from "./hwlab-node-lanes";
 
-const DASHBOARD_CONTRACT_VERSION = "draft-2026-06-26-p8-web-probe-sentinel-recovery";
+const DASHBOARD_CONTRACT_VERSION = "draft-2026-06-26-p9-desktop-view-density";
 const DASHBOARD_MAX_TEXT_BYTES = 16_000;
 
 export interface WebProbeSentinelServiceConfig {